There are a few such entries on SSC, intended
to be helpful rather than the reverse.
In short, -ssc- works exactly as advertised, but
there is no absolute rule that a package need
include Stata .ado and/or .hlp files.

What Nick describes is what I would have guessed. As a relatively new user
of Stata, I wonder if, now that we have the -findit- command, putting up
such information-only packages causes more confusion than they solve. It
seems like it is an extra step that can slow you down until you get to what
you really want.